package com.hmdp.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
@Slf4j
public class RedisIdWorker {

    private  static final long BEGIN_TIMESTAMP=1640995200L;

    private static final int COUNT_BITS=32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix){
        //        1.生成时间戳
        LocalDateTime now=LocalDateTime.now();
        long nowSecond=now.toEpochSecond(ZoneOffset.UTC);
        long timestamp=nowSecond-BEGIN_TIMESTAMP;
        //        2.生成序列号
        //        获取到当前日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        long count =stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);
        log.info(String.valueOf(count));
        //        3.拼接并返回
        return timestamp <<COUNT_BITS | count;
    }
}
